US 7467755 B2
A parts separator apparatus for use with a centrifugal separator includes a shredder apparatus located within an inlet section of the parts separator. The shredder apparatus shreds wet chip material prior to the wet chip material passing over a drop-out opening in the parts separator.
1. A parts separator apparatus for shredding wet chip materials and separating out unwanted solids from the material, said parts separator apparatus comprising:
a frame assembly comprising an inlet section having a wet chip inlet opening, an outlet section having a wet chip outlet opening and a drop-out opening disposed between said inlet and outlet sections;
a shredder apparatus disposed within said inlet section;
said shredder apparatus comprising a first shredder assembly having a plurality of first shredder members and a second shredder assembly having a plurality of second shredder members, said first and second shredder members being adapted to cooperate with one another to shred wet chip materials,
said shredder apparatus further comprising a fixed shaft located within said inlet section, a bearing assembly disposed on said shaft, a rotatable rotor disposed on said bearing assembly, and a seal assembly disposed on said shaft for enclosing said bearing assembly between said rotor and said shaft, said first shredder members attached to and rotatable with said rotor and said second shredder members seated on but free from rotation with said rotor; and,
a drive assembly coupled to said rotor to rotate said rotor relative to said shaft for actuating said shredder members of said one of said shredder assemblies relative to said shredder members of the other of said shredder assemblies whereby said first and second shredder members cooperate to shred wet chip materials within said inlet section.
2. A parts separator apparatus in accordance with
3. A parts separator apparatus in accordance with
4. A parts separator apparatus in accordance with
5. A parts separator apparatus in accordance with
6. A parts separator apparatus in accordance with
7. A parts separator apparatus in accordance with
8. A parts separator apparatus in accordance with
said first shredder members each has a plurality of spaced shredder arms; and
said drive assembly includes a reversible motor for causing said first shredder members to rotate in a first direction and in a second direction.
9. A parts separator apparatus in accordance with
10. A parts separator apparatus for shredding wet chip materials and separating out unwanted solids from the material, said parts separator apparatus comprising:
a frame assembly comprising an inlet section having a top wall, a bottom wall and a pair of spaced side walls, an outlet section having a wet chip outlet opening, and a drop-out opening disposed between said inlet and outlet sections; and
a shredder apparatus disposed within said inlet section, said shredder apparatus including a fixed shaft located within said inlet section, a bearing assembly disposed on said shaft, a rotatable rotor disposed on said bearing assembly, a seal assembly disposed on said shaft for enclosing said bearing assembly between said rotor and said shaft, first shredder members attached to and rotatable with said rotor, second shredder members seated on but free from rotation with said rotor, said second shredder members each including at least one fixed comb arm adapted to cooperate with at least one of said first shredder members; and
a drive assembly coupled to said rotor to rotate said rotor relative to said shaft.
11. The parts separator apparatus of
12. The parts separator apparatus of
13. The parts separator apparatus of
The present invention is directed generally to a parts separator apparatus for use with a centrifugal separator and in a method of shredding, and, more particularly, to a parts separator apparatus having a shredder apparatus disposed within the parts separator.
In the course of machining operations, scrap materials, known as wet chips, are generated. The wet chips usually include relatively small wet chips, referred to as granular wet chips, stringy pieces of wet chips as well as bales of wet chip material. Additionally, undesired solids such as bolts, nuts, etc. sometimes are found in the bales or batches of wet chip material. Wet chip materials are conveyed from one or more machine stations to a centrifugal separator station where the wet chip material is centrifugally separated into dry chips and fluid.
Prior to entering a centrifugal separator apparatus, wet chips pass through a parts separator apparatus generally having an air lock assembly as well a material drop-out opening. The wet chip material enters the parts separator, travels past the air lock assembly located in an inlet chute or section, flows over the drop-out opening, and then, after passing through an outlet chute or section, enters into the centrifugal separator. Heavy unwanted solid objects, such as bolts and nuts, drop out of the system at the location of the parts separator drop-out opening. The air lock apparatus, which is generally a paddle wheel assembly, comprises a plurality of rotatable paddles, such as illustrated in Nemedi U.S. Pat. No. 5,106,487. The air lock assembly serves to assist in maintaining a desired negative air pressure within the parts separator during the operation of the centrifugal separator. The negative air pressure is generated upon actuation of the centrifugal separator to which the parts separator normally is connected. The negative air pressure in the parts separator normally allows for wet chip material to be pulled from the air lock assembly and across the parts separator drop-out opening following which the wet chip material enters the centrifugal separator apparatus.
In some instances, wet chip material entering a parts separator originates from a plurality of machine stations. In this situation, the size of the wet chips generated at one station sometimes varies substantially from wet chips generated at another work station. As a result, wet chip material of different sizes enters the parts separator. Unfortunately, it has been found that, in some instances, larger size wet chips from one machine station fail to pass over the parts separator drop-out opening. Instead, some larger size wet chips drop out of the parts separator drop-out opening, where they have to be collected and reintroduced into the wet chip separation system. It is thus desired to limit this problem.
Further, it has been found that, on occasion, some larger undesired solids, e.g., bolts or nuts travel at such a relatively high velocity within the parts separator apparatus that they cause damage to the air lock assembly or the parts separator frame. It is also desired to limit this problem.
Further, it is desired to limit the need for a conventional paddle-wheel-type air lock assembly that often is disposed within a parts separator apparatus.
Briefly, a shredder apparatus having a shredder wheel assembly attached to a reversible motor, such as shown and disclosed in my pending patent application, Ser. No. 10/611,526, which is hereby incorporated by reference in its entirety in the present application, is disposed within the inlet section of a parts separator apparatus. The shredder apparatus is located within the inlet chute of the apparatus preferably contiguous to the parts separator drop-out opening. Wet chip material of varying sizes and/or bales enter the inlet chute of the parts separator apparatus where the wet chip material is shredded into wet chip material having a relatively uniform size. The shredded wet chip material then passes over the parts separator drop-out opening into the parts separator outlet chute from where it enters a centrifugal separator apparatus where the wet chips are centrifugally separated into dry chips and fluids.
In some instances, where relatively large undesired solid objects, e.g. bolts, nuts, etc., are found in the wet chip material entering the parts separator, the shredder apparatus is unable to shred these objects. The shredder apparatus will sense these undesired objects and stop. The shredder apparatus motor then will change direction whereupon shredder wheels will reverse direction and pick up the undesired object(s) and transport the object(s) within the system whereby the undesired object(s) can relatively easily exit the parts separator through the drop-out opening. Accordingly, the velocity of an undesired object within the parts separator can be reduced and the direction of the undesired object within the parts separator apparatus can advantageously changed.
Finally, in some instances, utilizing the above-referred shredder apparatus within the parts separator obviates the need for an air lock assembly in an inlet chute of the parts separator apparatus.
Referring to the drawings,
Parts separator 10 includes a frame assembly comprising a chute member 16 comprising a first, inlet section 18 that extends in a first direction from outboard end 12 and has an inlet opening; a second, outlet section 20 that extends in the first direction and has an outlet opening; and, a heavy material drop-out opening 22 that is located in the bottom wall 24 at the exit end of first chute section 18 and is positioned contiguous to the first and second sections 18, 20. A drop-out chute 26 is positioned below heavy material drop-out opening 22.
End 14 of parts separator 10 includes flange 28, which is illustrated as being connected to the top of a centrifugal separator 30, such as is offered for sale by Intersource Recovery Systems, Inc., Kalamazoo, Mich. and is shown in Intersource's catalog entitled Chip Processing, copyrighted in 1997 or such as is shown in any one of U.S. Pat. Nos. 4,936,822, 5,252,208, 5,264,124, 5,275,727, 5,944,992, and 6,129,851, all of which are hereby incorporated in their entirety herein. Typically, upon actuation of the centrifugal separator apparatus 30, a vacuum or negative air pressure is created within parts separator apparatus 10, such that wet chips and other materials entering parts separator 10 are pulled through the parts separator apparatus into centrifugal separator apparatus 30, where the wet chips are centrifugally separated into dry chips and fluid.
Baffle plates 32, 34 are disposed within parts separator apparatus 10 to assist in directing materials through parts separator apparatus 10. Baffle plate 36 can be mounted for adjustment on the bottom wall 24 of chute section 18. Similarly, baffle plate 38 can be mounted for adjustment on bottom wall 27 of drop-out chute 26, while baffle plate 40 can be mounted for adjustment on baffle plate 32. Baffle plates 36, 38, 40 can be adjustably positioned to either increase or decrease the open area surrounding material drop-out opening 22 at the exit end of first chute section 18, as well as the size of the entrance opening leading into second chute section 20.
Heretofore a rotary air seal assembly, such as illustrated in Nemedi U.S. Pat. No. 5,106,487, normally was disposed within the first chute section 18 of chute member 16. The rotary air seal, which comprises a plurality of rotatable paddles, served to act as a seal to some extent and, at the same time, to contact wet chip material to be separated in the first chute section 18 and to assist the material as it traveled along in the parts separator apparatus 10. In the particular embodiment shown herein, the rotary air seal assembly has been replaced by shredder apparatus 100 disposed within the first section 18 of chute member 16.
Motor mount wall 124 extends outward from base wall 104. Wall 124 is substantially parallel to side wall 110. A second wall 125 is spaced from and substantially parallel to wall 124. Top wall 126, which can be made of either a rigid or flexible material, is removably attached to spaced side walls 124, 125.
A drive assembly 140 includes motor 142 having a shaft 144 (see
Positioned below motor 142 is fixed shaft 164 (see also
As shown in
Faceplate 208 is bolted at 210 to sidewall 125, while faceplate 212 is bolted at 214 to a sidewall 110. Shaft end 166 extends through an opening in faceplate 208, and shaft end 168 extends through an opening in faceplate 212. Lock member 216 is disposed on shaft 164 at shaft end 166 and seats against faceplate 208. Lock member 218 is disposed on shaft 164 at shaft end 168 and seats against faceplate 212. Each lock member 216, 218 is illustrated as being welded to a respective faceplate 208, 212. If desired, other shaft locking arrangements, for example, a two piece clamp trough, could be employed. Similarly, the shaft ends could be threaded and lock nuts could be utilized in place of the locking arrangement shown in the drawings.
Referring next to
A plurality of spaced shredder comb members 262 is mounted or seated on rotor 194, and is positioned so that a comb member 262 is adjacent a shredder wheel 250. As seen in the embodiment of
Each comb member 262 is adapted to be inserted on rotor 194, and seats on the rotor at the location of a comb member opening; however, the comb members 262 are free from rotation (i.e., do not rotate) with rotor 194. Each comb member 262 is keyed at the location of slot 272 to key bracket 278, the later being fixed to rear wall 108. Accordingly, shredder wheels 250 rotate relative to fixed adjacent comb members 262 and together, the shredder wheels 250 and comb members 262 cooperate to shred or otherwise cut wet chip material passing through shredder apparatus 100.
Spacers, in the form of washer-like members 280, are disposed on rotor 194 and positioned between adjacent shredder wheels 250 and comb members 262. The spacers 280 serve to space the shredder wheels 250 and comb members 262 apart so that, should any vertical misalignment of a shredder wheel 250 occur, the spacer 280 will preclude contact with another shredder wheel 250 or comb member 262.
Compression spring assembly 282 formed of compression spring 284 and spring plate 286 is positioned against the outboard surface of comb member 262 located near one end of rotor 194. Compression spring assembly 288 formed of compression spring 290 and spring plate 292 is positioned against the outboard surface of comb member 262 near the opposite rotor end.
As illustrated in
Upon actuation of drive assembly 140, rotor 194 rotates and travels in a direction, represented by an arrow B, that is the same direction as the direction of the wet chip material travel. As the wet chip material passes into shredder apparatus 100, shredder arms 252 engage the wet chip materials and direct at least the stringy wet chips toward a shredding station disposed at comb arm 268. Comb arms 268 and shredder arms 252 cooperate to shred the wet chips. As rotor 194 continues to rotate, shredded wet chips drop onto bottom wall 104 and pass toward and over drop-out opening 22. The shredded wet chips, now reduced to a desired size, then can be processed out of shredder apparatus 100.
In the event that a heavy, unwanted solid enters shredder apparatus 100, the solid travels in chute section 18 to the shredder station disposed at the comb arm 268. Inasmuch as shredder apparatus 100 cannot shred the unwanted solid, an increase in the motor amperage occurs, whereupon motor 142 stops and changes direction of rotation. With the change in the direction of rotation of the motor 142 (and in particular motor shaft 144), rotor 194 will change its direction of rotation, and shredder wheels 250, fixed to the rotor 194, will then rotate in the direction indicated by arrow C. As the shredder wheels 250 rotate in the direction of arrow C, the unwanted solid will be carried on one or more surfaces 260 on the shredder arm 252, and transported in the direction of arrow C. The unwanted solid may be transported in somewhat of a circular direction until the unwanted solid, for example, drops onto the top of first comb arm 266 and passes therealong into the drop-out opening 22. After rotor 194 travels in the direction of arrow C for a period of time, for example, until at least the unwanted solid passes into the drop-out opening, motor 142 again changes direction and rotor 194 travels in the direction of arrow B, whereupon shredding of the wet chip material resumes. As a result of this reversible motor operation, the speed of the undesired solid has been reduced and the direction of the solid has been changed, both of which serve to obviate parts separator damage which heretofore sometimes has occurred due to unwanted solids.
In normal operation, centrifugal separator 30 is first activated whereby the centrifugal separator will achieve its desired speed of operation, causing a negative pressure to be created in parts separator apparatus 10 during the start-up step. Then shredder apparatus 100 will be activated and shredding of wet chip material will commence. As the wet chip material is shredded, the negative air pressure will assist in pulling the shredded wet chip material over drop-out opening 22. Any unwanted solids that may have escaped the shredding operation will drop out of the system through opening 22. The unwanted solids can be collected in an unwanted solid bin or the like. The shredded wet chip material passes on to the centrifugal separator 30, where it is centrifugally separated into dry chips and fluid.
In addition to the shredder apparatus serving as a device to shred wet chip material within the parts separator, it has been found that shredder apparatus 100 may obviate the need for a conventional air seal assembly often utilized in the inlet chute of a parts separator. Further, the velocity of an unwanted solid is changed within the first chute section 18 as the unwanted solid changes direction as it is directed toward the parts separator drop-out opening when the rotor 194 reverses its direction upon sensing the unwanted solid.
Upon contact of an unwanted solid with comb arm 268, increased amperage occurs in motor 142 and is sensed by sensor 306. The controller 302 receives signals from the sensor 306 representative of the increased amperage, and, in response, turns off motor 142 and opens forward switch 304 to a disconnect position. Following a dwell period of, for example, approximately one second, the controller 302 closes reverse switch 308 and actuates motor 142, causing motor shaft 144 to rotate in the direction of arrow C.
Following a time period during which an unwanted solid is transported to the top of comb arm 266, the controller 302 turns off motor 142 and opens reverse switch 308. Following a dwell period of, for example, approximately one second, the controller closes forward switch 304 and actuates motor 142, whereupon motor shaft 144 again rotates in the direction of arrow B and shredding occurs at the location of shredder arm 268.
It is appreciated that while one system 300 for actuating motor 142 to permit shaft rotation in the direction of arrows B and C has been shown, other systems for rotating motor shaft 144 in the desired directions would be apparent to one of ordinary skill in the art. For example, rather than using the controller 302 to control the motor 142 to make motor shaft 144 rotate in a particular direction for a particular amount of time, the controller may control the motor 142 to make the motor shaft 144 rotate in a particular direction for a particular number of revolutions or over a particular angular distance.
Similarly, it is appreciated that a timing switch can be employed to initially actuate the centrifugal separator 30 and, after the desired time period during which separator 30 achieves its desired operational speed, shredder apparatus 100 then can be actuated.
While the bales of stringy wet chips are shredded principally at the shredder stations at the second comb arms 268 in the illustrated embodiment, shredding can also occur at the location of the first comb arms 266 during the course of the unwanted solid removal.
While comb arm 268 has been shown to have a serrated shredding or cutting surface 274 along side 276, it may be that, in some applications, serrations are not required. Accordingly, a person of ordinary skill in the art could select other shapes for the sides 276, for example, a smooth surface.
While one or more embodiments have been illustrated and described in detail herein, it will be understood that modifications and variations thereof may be effected without departing from the spirit of the invention and the appended claims.